Rimes' comments didn't sit well with Glanville, 40, who responded the following day. "Someone is trying to get under my skin by calling my children 'her boys. So transparent!" the "Real Housewives of Beverly Hills" star tweeted. "They are my boys, Eddie's boys and your stepsons. . .for now."

The model also retweeted a fan who asked, "Why is it ok for LeAnn to whore out Brandi's kids on Twitter, but they can't appear on The Real Housewives of Beverly Hills?" (Cibrian refuses to let his sons appear on the Bravo reality show.)

Rimes, who performed in Lincoln City, Oregon, chose not to retaliate via the social networking site. She did, however, share pictures of Cibrian, 39, Mason, 9, and Jake, 5. Rimes also retweeted a fan who wrote that "being a stepmom is such a hard role to play, but only the strongest women can handle it."

Choosing not to respond to Glanville directly, Rimes decided to focus on the positives in her life. "I'm going to bed as one of the most blessed girls in the world," the musician tweeted. "I am so grateful for all the love I have in my heart and in my life."

In August, Rimes, 30, voluntarily checked into rehab for anxiety and stress. The "Borrowed" singer later said she had been the victim of cyber bullying in the wake of her 2009 affair with Cibrian.

"I think it's really hard to deal with Twitter and Facebook," Rimes told the Boston Herald. "And it's hard to take it day after day of reading and seeing things that someone you don't even know says about you. As much as you said you don't want it to penetrate, it does, because you're human."